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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - DSE miscompile"
href="http://llvm.org/bugs/show_bug.cgi?id=17405">17405</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>DSE miscompile
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hfinkel@anl.gov
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11296" name="attach_11296" title="bugpoint reduced test case (part to optimize)">attachment 11296</a> <a href="attachment.cgi?id=11296&action=edit" title="bugpoint reduced test case (part to optimize)">[details]</a></span>
bugpoint reduced test case (part to optimize)
I've used bugpoint to isolate a miscompile from DSE.
opt bugpoint-tooptimize.ll -basicaa -dse -S > bugpoint-tooptimize-opt.ll
clang bugpoint-tooptimize.ll bugpoint-tonotoptimize.ll -o /tmp/t1
clang bugpoint-tooptimize-opt.ll bugpoint-tonotoptimize.ll -o /tmp/t2
$ /tmp/t1
false
true
false
true
false
...
$ /tmp/t2
false
false
false
false
false
...
The only change that DSE is making is to remove 4 (apparently not all dead)
stores.</pre>
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